Shavrin, Konstantin N.; Krylova, Irina V.; Shvedova, Inna B.; Okonnishnikova, Galina P.; Dolgy, Igor E.; Nefedov, Oleg M. Journal of the Chemical Society, Perkin Transactions 2: Physical Organic Chemistry (1972-1999), 1991 , # 12 p. 1875 - 1882